A model of scrolling on touch-sensitive displays |
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Affiliation: | 1. University of Magdeburg, Universitätsplatz 2, Magdeburg 39106, Germany;2. Research Campus STIMULATE, Universitätsplatz 2, Magdeburg 39106, Germany;3. University of Koblenz - Landau, Universitätsstraße 1, Koblenz, 56070 Germany;1. Department of Plastic, Reconstructive, and Hand Surgery, Academic Medical Center, Amsterdam, The Netherlands;2. Department of Radiology, Leiden University Medical Center, Leiden, The Netherlands;3. Department of Intelligent Systems, Faculty of Electrical Engineering, Applied Mathematics and Computer Science, Delft University of Technology, Delft, The Netherlands;4. Research Institute MOVE, Faculty of Human Movement Sciences, VU University, Amsterdam, The Netherlands;5. Section Biomechatronics & Biorobotics, Faculty of Material Sciences, Delft University of Technology, Delft, The Netherlands;6. Department of Radiology, Academic Medical Center, Amsterdam, The Netherlands;7. Department of Plastic, Reconstructive, and Hand Surgery, Red Cross Hospital, Beverwijk, The Netherlands |
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Abstract: | Scrolling interaction is a common and frequent activity allowing users to browse content that is initially off-screen. With the increasing popularity of touch-sensitive devices, gesture-based scrolling interactions (e.g., finger panning and flicking) have become an important element in our daily interaction vocabulary. However, there are currently no comprehensive user performance models for scrolling tasks on touch displays. This paper presents an empirical study of user performance in scrolling tasks on touch displays. In addition to three geometrical movement parameters—scrolling distance, display window size, and target width, we also investigate two other factors that could affect the performance, i.e., scrolling modes—panning and flicking, and feedback techniques—with and without distance feedback. We derive a quantitative model based on four formal assumptions that abstract the real-world scrolling tasks, which are drawn from the analysis and observations of user scrolling actions. The results of a control experiment reveal that our model generalizes well for direct-touch scrolling tasks, accommodating different movement parameters, scrolling modes and feedback techniques. Also, the supporting blocks of the model, the four basic assumptions and three important mathematical components, are validated by the experimental data. In-depth comparisons with existing models of similar tasks indicate that our model performs the best under different measurement criteria. Our work provides a theoretical foundation for modeling sophisticated scrolling actions, as well as offers insights into designing scrolling techniques for next-generation touch input devices. |
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Keywords: | Modeling Touch displays Scrolling Fitts? law |
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